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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alipay.sofa.jraft.test.atomic.server;

import java.io.File;
import java.io.IOException;
import java.util.TreeMap;

import org.apache.commons.io.FileUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.alipay.remoting.rpc.RpcServer;
import com.alipay.sofa.jraft.entity.PeerId;
import com.alipay.sofa.jraft.rpc.RaftRpcServerFactory;
import com.alipay.sofa.jraft.test.atomic.HashUtils;
import com.alipay.sofa.jraft.test.atomic.server.processor.CompareAndSetCommandProcessor;
import com.alipay.sofa.jraft.test.atomic.server.processor.GetCommandProcessor;
import com.alipay.sofa.jraft.test.atomic.server.processor.GetSlotsCommandProcessor;
import com.alipay.sofa.jraft.test.atomic.server.processor.IncrementAndGetCommandProcessor;
import com.alipay.sofa.jraft.test.atomic.server.processor.SetCommandProcessor;

/**
 * Atomic server with multi raft groups.
 * @author boyan ([email protected])
 *
 * 2018-May-02 10:50:14 AM
 */
public class AtomicServer {

    private static final Logger             LOG    = LoggerFactory.getLogger(AtomicServer.class);

    private TreeMap nodes  = new TreeMap<>();
    private TreeMap           groups = new TreeMap<>();
    private int                             totalSlots;
    private StartupConf                     conf;

    public AtomicRangeGroup getGroupBykey(String key) {
        return nodes.get(HashUtils.getHeadKey(this.nodes, key));
    }

    public int getTotalSlots() {
        return this.totalSlots;
    }

    public AtomicServer(StartupConf conf) throws IOException {
        this.conf = conf;
        LOG.info("Starting atomic server with conf: {}", this.conf);
        this.totalSlots = conf.getTotalSlots();
    }

    public TreeMap getGroups() {
        return this.groups;
    }

    public void start() throws IOException {
        PeerId serverId = new PeerId();
        if (!serverId.parse(conf.getServerAddress())) {
            throw new IllegalArgumentException("Fail to parse serverId:" + conf.getServerAddress());
        }

        FileUtils.forceMkdir(new File(conf.getDataPath()));
        //同一个进程内 raft group 共用同一个 RPC Server.
        RpcServer rpcServer = new RpcServer(serverId.getPort());
        //注册 raft 处理器
        RaftRpcServerFactory.addRaftRequestProcessors(rpcServer);
        //注册业务处理器
        rpcServer.registerUserProcessor(new GetSlotsCommandProcessor(this));
        rpcServer.registerUserProcessor(new GetCommandProcessor(this));
        rpcServer.registerUserProcessor(new IncrementAndGetCommandProcessor(this));
        rpcServer.registerUserProcessor(new CompareAndSetCommandProcessor(this));
        rpcServer.registerUserProcessor(new SetCommandProcessor(this));

        long step = conf.getMaxSlot() / totalSlots;
        if (conf.getMaxSlot() % totalSlots > 0) {
            step = step + 1;
        }
        for (int i = 0; i < totalSlots; i++) {
            long min = i * step;
            long mayMax = (i + 1) * step;
            long max = mayMax > conf.getMaxSlot() || mayMax <= 0 ? conf.getMaxSlot() : mayMax;
            StartupConf nodeConf = new StartupConf();
            String nodeDataPath = conf.getDataPath() + File.separator + i;
            nodeConf.setDataPath(nodeDataPath);
            String nodeGroup = conf.getGroupId() + "_" + i;
            nodeConf.setGroupId(nodeGroup);
            nodeConf.setMaxSlot(max);
            nodeConf.setMinSlot(min);
            nodeConf.setConf(conf.getConf());
            nodeConf.setServerAddress(conf.getServerAddress());
            nodeConf.setTotalSlots(conf.getTotalSlots());
            LOG.info("Starting range node {}-{} with conf {}", min, max, nodeConf);
            nodes.put(i * step, AtomicRangeGroup.start(nodeConf, rpcServer));
            groups.put(i * step, nodeGroup);
        }
    }

    public static void start(String confFilePath) throws IOException {
        StartupConf conf = new StartupConf();
        if (!conf.loadFromFile(confFilePath)) {
            throw new IllegalStateException("Load startup config from " + confFilePath + " failed");
        }
        AtomicServer server = new AtomicServer(conf);
        server.start();
    }

    //for test
    public static void main(String[] arsg) throws Exception {
        start("config/server.properties");
    }
}